Apache-Common-dbutils camel support

Dependent package:

      <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.1.0.7</version>
        </dependency>
        <dependency>
            <groupId>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.7</version>
        </dependency>

 Since it is just a small tool, there is no need to use a connection pool

Query tool class QueryRunnerDao:

public class QueryRunnerDao {
    private final QueryRunner runner = new QueryRunner();
    private Connection connection;


    public QueryRunnerDao() {
        getConn();
    }

    public void getConn() {
        try {
             connection = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl", "scott", "xxx");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public <T> List<T> queryByBeanList(String sql, Class<T> c, Object... params) throws SQLException {
        List<T> rs = runner.query(connection, sql,
                new BeanListHandler<T>(c), params);
        DbUtils.close(connection);
        return rs;
    }
}

UserTabColumn：

package com.my.db.util;

public class UserTabColumn {
    private String columnName;
    private String dataType;

    public String getColumnName() {
        return columnName;
    }

    public void setColumnName(String columnName) {
        this.columnName = columnName;
    }

    public String getDataType() {
        return dataType;
    }

    public void setDataType(String dataType) {
        this.dataType = dataType;
    }
}

 Get the field name and field type: TableUtils 

import java.sql.SQLException;
import java.util.List;

public class TableUtils {

    public List<UserTabColumn> queryDBColumn(String tableName) {
        try {
            return QueryRunnerDao.getInstance().queryByBeanList("select column_name,data_type from USER_TAB_COLUMNS t where table_name=upper(?)",
                    UserTabColumn.class, tableName);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {
        List<UserTabColumn>  list =   new TableUtils().queryDBColumn("test_table");
        list.stream().forEach(userTabColumn -> {
            System.out.println(userTabColumn.getColumnName()+","+userTabColumn.getDataType());

        });
    }
}

After running, it is found that there is list data, but the content inside is empty. The reason is that the database field is underlined and javaBean is hump.

Solution: Change BeanListHandler to the following to create

    public <T> List<T> queryByBeanList(String sql, Class<T> c, Object... params) throws SQLException {
        //new BasicRowProcessor(new GenerousBeanProcessor()) 的作用就是转换器，GenerousBeanProcessor可以实现数据库与java驼峰转换
        List<T> rs = runner.query(connection, sql,
                new BeanListHandler<T>(c, new BasicRowProcessor(new GenerousBeanProcessor())), params);
        DbUtils.close(connection);
        return rs;
    }